Have been wearing my Oura Ring(4) for a month plus now, got it Free from a clinical trial.
Just need to wear the ring for 2 years and at the end I can keep it.
The monthly subscription is also paid by the clinical trial during this two years period.
I like the stress tracking but I think the sleep tracking it not very good.
It does not track accurately the time you sleep compared to Garmin Tracker or Fitbit.
Normally I like to sit on my bed 3 hours before bedtime to relax and watch some youtube and so the tracking is three hours off where your sleep latency can be 2-3 hours thus affecting your sleep score , so every morning I need to adjust it manually the time I actually start sleeping.
Yesterday I was doing some rooftop painting and below is the graph of my stress level throughout the day.